OpenSecrets.org
At the OpenSecrets home page there are links to several organizations that track campaign finance issues.
Federal Election Commission
* FinancialStability.gov
* Treasury Department - TARP Reports
* American Enterprise Institute
* Brookngs Institute
* CATO Institute
* Center on Budget and Policy Priorities
* Economic Policy Institute
* Heritage Foundation
* Kaiser Family Foundation
* NBER: the National Bureau of Economic Research
* SourceOECD (fulltext OECD publications, including data)
* RAND Corporation
* Resources for the Future
* Tax Policy Center
* Urban Institute
* World Resources Institute
* World Trade Organization